Electric motor.



H. E. ADAMS.

ELECTRIC MOTOR.

APPLICATION FILED IAN.I9,19I4.

1,137,729. Patented May l, 1915.

3 SHEETSSHEET 2.

WI TN E 885 8 v //V VE/V TOR H. E. ADAMS. ELECTRIC MOTOR.

APPLICATION FILED Jim-19,1924

1.{1332 729}a Patsmed M 1915.

E3 SHEETS-8' TE? 3.

WITNESSES I/VVE/VTOR .the following specification and is HQMER 11. ADAMS, or roar won-Tn, TEXAS.

ELECTRIC MOTOR. I

To all/whom it may concern:

- Be it known that I, HOMER E. AoAMs, a citizen of the United States, residing at Fort WVorth, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Electric Motors, of which the following is a specification.

My invention relates to electric motors,

and its object is to provide an electric motor that will operate with equal efliciency-on either direct or alternating current.

Another objeetis to provide an electric motor of the character describedthatmay -be wound and. proportionedto de elop any reasonable power, andwhich will involve no greater expense .either in construction or operation than such motors as are now i common use. q i

A further object is to provide an electric motor that will operate on either direct or alternating 'current-and will have an equally strong starting torque in either case.

W'ith these and various other objects in View, myinvention has relation to certain novel features of theconstruction and operation, an [example ",of Which is described in illustrated in the accompanying drawings, wherein Figurel is diagrammaticview of the motor in frontelevation, showing the manner of winding the armature and field magnets together with all electrical connections. Fig. 2 is a developmentof the armature winding,- showing the directions of current in the conductors at the moment when each brush has contact with two commutator segments. Fig. 3 is a similar View, showing the circuit relations of the armature conductors at the moment when each brush has contact with only one commutator segment. Fig. l

is a simplified diagram, explanatory of the motor connections. I

Referring now more particularly to the drawings, wherein like reference characters designate similar parts in all the figures,

'the numeral 1 denotes the field magnet yolre,

preferably of the common annular form, and 2 designates the field magnet cores, which are interiorly mounted upon the yoke in the usual well known manner. These projecting cores are six in number, their windings being respectively designated by the letters A,'A, B, B C, and C. The three uppermost field magnet windings 3 are Specification of Letters Patent.

'that the poles in the field,

- Patented May 1-, 11115.

Application filed January 19, 1914. Serial No. 813,046.

respectively series connected with the three opposite lower windings 3, and are arranged to produce an opposite polarity to that set up by the lower windings 3 when ener'gir'ed.

Thus it is seen that my motor is electrically bipolar, there being three projecting cores per pole. r

The numerals. 1, 5 and 6 respecti elyde note the direct connections between the pairs of magnets A A, B B and C C. As is made veryclear by the diagram' shown in Fig. 4, the three pairs of opposite field coils are Yfconnected-at a point 7. g 1 Vith the commutator 10 there are correand 12 being substantially one hundred and eighty degrees apart, while the brush 13 closely adjacent to the brush 12. For the ated three brushes, respectively denoted by the numerals 11, 12 and 13, the brushesjjl.

purpose of .this explanation the brush 1'}.

will be considered negative and the brushes 12 and 13 positive. The brush 11 has connection with one of the,motor terminals as indicated at 14, and from the other terminal a wire 15 is extended to the coil C. lVires 16 and 17 respectively establish connection between the brushes 12 and 13 andthe'coils A and B.

The armature shown is of a common double-1ap-'wound type, audit is to be un-.

derstood that the armature construction and winding is not claimed as a novel feature of my motor. The novel features of my in vention lie in the particular manner of connecting the field'coils both with one another and with the motor terminals, and in the use of three brushes having the relation specified. Through the embodiment in my motor. f these unusual features, equal ethciency is obtained from the operation of th'e motor under either a direct or alternating current. It will of course be understood the segments in the commutators and the coils in the armature may be varied in number as in any motorl V c 1 "When supplied. with direct current, my motor operates in substantially the same manner as an ordinary series'woi'uid D C motor, the direction of current in the armatare conductors being constant in a certain direction adjacent to the north poles of the field, and being constant in the other direction adjacent to thesouth pole of the field.

t may be noted however that the coils A and A will not be energized except at those instants when the brushes establish a short circuit between two adjacent commutator segments, illustrated in Fig. 2.

When my motor is supplied with alternating current. it may be considered to act as asplit phase induction motor having a 1'0- tating magnetic field.

The invention presented as including all such modifications and changes as properly come within the scope of the following claims.

hat I claim is:

l. An electric motor, comprising a yoke, a plurality of magnet cores projecting rigidly from the yoke, three sets of Y-connected windings respectively mounted upon said cores, an armature and a commutator having the usual relation, three brushes bearing upon the commutator, conductors extending from two of the brushes to two of the sets of field windings, and conductors extending from the motor terminals respectively to the other brush and other set of field windings.

2. An electric motor three sets of ings, an armature and a commutator having the usual relation, three brushes bearing upon the commutator, conductors extending from two of the brushes to two of the sets of field magnet windings, and conductors extending from the motor terminals respectively to the other brush and other set of field windings.

3. An electric motor,

comprising a yoke,

comprising a yoke,

three equal angula-rly displaced interconnected sets of field coils carried by the yoke, one of the, sets having connection with one of the motor terminals, an armature and a commutator connected in thevusual relation, and three brushes bearing upon the commutator two of which have electrical connection with angularly displaced field Windtwo of the sets of field coils, while the other has connection with the other terminal.

it. An electric motor, comprising a yoke, a plurality of'inagnet cores p rojecting therefrom, Y-connected sets of windings mounted upon said cores, the windings of each set being oppositely disposed and series connected, one of said windings being in electrical connection with'one of the motor terminals, and three brushes bearing upon the commutator, one of which has electrical con nection with the other motor terminal, while the other two are respectively connected to the other two sets of field windings.

5. An'electrie motor, comprising a double wound armature, three sets of interconnected angularly displaced field windings correlated with the armature in the usual relation thereto, a commutator bearing the usual relation to the armature and brushes bearing upon the commutator, so arranged as to throw the armature windings alternately into action.

(3. An electric motor, comprising three sets of angularly displaced Y-connected field coils. one set of the coils having connecti on with one of the motor terminals, an armature and commutator having the usual relation and three brushes bearing upon the armature two of which are adjacent and are respectively connected to two of the sets of field coils, the third brush being substantially opposite to one of the others and being electrically connected to the other motor terminal.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HOMER E. ADAMS.

lVitnesses:

J. MURRAY, JACK O. SCI-ILEY. 

